core/src/main/java/io/seata/core/rpc/processor/server/ServerHeartbeatProcessor.java
/*
 *  Copyright 1999-2019 Seata.io Group.
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package io.seata.core.rpc.processor.server;

import io.netty.channel.ChannelHandlerContext;
import io.seata.core.protocol.HeartbeatMessage;
import io.seata.core.protocol.RpcMessage;
import io.seata.core.rpc.RemotingServer;
import io.seata.core.rpc.processor.RemotingProcessor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * process client heartbeat message request(PING).
 * <p>
 * process message type:
 * {@link HeartbeatMessage}
 *
 * @author upchh@example.com
 * @since 1.3.0
 */
public class ServerHeartbeatProcessor implements RemotingProcessor {

    private static final Logger LOGGER = LoggerFactory.getLogger(ServerHeartbeatProcessor.class);

    private RemotingServer remotingServer;

    public ServerHeartbeatProcessor(RemotingServer remotingServer) {
        this.remotingServer = remotingServer;
    }

    @Override
    public void process(ChannelHandlerContext ctx, RpcMessage rpcMessage) throws Exception {
        try {
            remotingServer.sendAsyncResponse(rpcMessage, ctx.channel(), HeartbeatMessage.PONG);
        } catch (Throwable throwable) {
            LOGGER.error("send response error: {}", throwable.getMessage(), throwable);
        }
        if (LOGGER.isDebugEnabled()) {
            LOGGER.debug("received PING from {}", ctx.channel().remoteAddress());
        }
    }

}
